Echo cancellation using transversal filters

Details Echo cancellation using transversal filters Echo cancellation using transversal filters

H - Electricity

04

B

379/64, 340/72

H04B 15/00 (2006.01) H04B 3/23 (2006.01) H04L 25/08 (2006.01)

Patent

CA 1173128

ECHO CANCELLATION USING TRANSVERSAL FILTERS Abstract of the Disclosure A transversal filter echo canceller includes two stores each for storing a set of coefficients for the transversal filter. The suitability of a set of coefficients stored in one of the stores is checked by supplying a pulse to the receive path and transversally filtering it, and comparing the level of the resultant transmit path signal, after subtraction of the transversally filtered pulse, with a threshold. At the same time the impulse response before the subtraction is stored in the other store. If the threshold is exceeded the functions of the two stores are interchanged and the check is repeated. The checking can be effected only once for a transmission line not subject to change, or, in the case of a transmission line which is subject to change, at the start of each telephone connection established via the line and optionally during conversation pauses during the connection. -i-

387779

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